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 \mathop \pi \nolimits^ + \mathop \pi \nolimits^ - \mathop \pi \nolimits^0 $, branching ratio and plane asymmetry for $ \eta \to \mathop \pi \nolimits^ + \mathop \pi \nolimits^ - \mathop {\rm{e}}\nolimits^ + \mathop {\rm{e}}\nolimits^ - $, and first observation of $ \eta \to \mathop {\rm{e}}\nolimits^ + \mathop {\rm{e}}\nolimits^ - \mathop {\rm{e}}\nolimits^ + \mathop {\rm{e}}\nolimits^ - $ along with its branching ratio determination. Also preliminary studies of $ \eta \to \mathop \pi \nolimits^0 \gamma \gamma $ decay channel are presented as well as physics perspectives for many different processes for the ongoing KLOE−2 data taking.
Highlights
The KLOE experiment operates at DA NE, the Frascati -factory
The → + −e+e− decay allows to probe the electromagnetic structure of the meson and to compare the predictions of the branching ratio values based on different theoretical models such as Vector Meson Dominance, Chiral Perturbation Theory or chiral effective Lagrangian [17, 20-22]
The experimental value of this branching fraction [26-28] has been decreasing with time, along with the increase of machine luminosities and the available statistics of the meson samples produced, showing that the main issue in the measurement of the branching fraction is the correct background estimate
Summary
The KLOE experiment operates at DA NE, the Frascati -factory. DA NE is an e+e−collider running at the center of mass energy of the meson (1020 MeV) that is produced nearly at rest. The measurement is based on an integrated luminosity of 1.7 fb−1 decays analyzing the chain → (→e+e−e+e−) , with the monochromatic photon of energy E ~ 363 MeV.
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