Abstract

Recent results obtained with KLOE data on light meson decays, together with perspectives for the current KLOE-2 run, are reviewed.

Highlights

  • The KLOE-2 experiment aims to enlarge and extend the KLOE physics programs with a larger data set and an upgraded detector

  • Vector Meson Dominance (VMD) model fails to describe the vector to pseudoscalar transition form factor (TFF) for the process ω → π0μ+μ−, as measured by the NA60 collaboration [21]

  • The large data sample of light mesons collected with the KLOE detector provided several state-ofthe-art measurements on the properties of light scalar, pseudoscalar and vector mesons

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Summary

Introduction

The KLOE-2 experiment aims to enlarge and extend the KLOE physics programs with a larger data set and an upgraded detector. A new measurement has been carried out with KLOE data (KLOE16), with an independent and ∼ 4 times larger data set (1.7 fb−1), a new analysis scheme and an improved Monte Carlo simulation, providing with improved accuracy the parameters of the decay matrix [15]. Background scaling factors are obtained by fitting data with MC distribution for two variables: the missing mass squared of the π0 and the opening angle between photons in the π0 rest frame (Fig. 1). The resulting Dalitz plot density has been fitted, after background subtraction, with the complete third order polinomial expansion of Eq (3), folded with smearing matrix and analysis efficency. The smearing matrix of the η → π+π−π0 Dalitz plot is very close to diagonal For this reason, acceptance corrected data have been used to directly fit Eq (3).

Dalitz decays of the φ meson
The π0 Transition Form Factor at KLOE-2
Findings
Conclusions
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