KLOE first results on hadronic physics

TL;DR

The KLOE experiment at DAFNE has collected extensive data on phi decays, providing precise measurements of various decay modes and insights into meson structures, including potential evidence for direct decay processes.

Contribution

This paper presents the first results from KLOE on phi decay modes, including new decay channels and measurements that shed light on meson structures and decay dynamics.

Findings

Precise measurements of phi decays into multiple mesons.

Evidence for direct decay components in phi to pi+pi-pi0.

Measurement of rho meson parameters, including mass differences.

Abstract

The KLOE detector at DAFNE, the Frascati Phi-factory, has collected about 8 millions phi decays in 1999. Measurements of Phi decays into pi0, eta, eta', f0(980), a0(980) and pi+pi-pi0 have been performed with statistical accuracy better than previously in a single detector, as well as new decay modes. Phi radiative decays can clarify the nature of f0 and a0 (are they 4 quark states?) and measure the eta-eta' mixing angle. Analysis of Phi->pi+pi-pi0 allows us to extract the possible existence of direct decay in addition to the dominant rho-pi mode and to obtain a precise measurement of the rho parameters such as the mass difference between the charged and neutral rho, previously never seen.