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 Fp(q12 = Mϕ2, 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.
Highlights
The KLOE the peak experiment at and 240 pb−1 atht e√Fsra=sc1atGi eV-f.aTcthoersye, DA dataNE, has collected 2.5 fb−1 of e+e− collisions at provide high statistics samples of light mesons, allowing detailed studies of their decay dinamics and transition form factors
The → + − decay has been studied to search for a possible contribution from chiral anomaly, while a new preliminary high statistics Dalitz plot analysis of the → + − 0 will increase the accuracy of the light quark mass ratio
A new data taking is planned in years 2014–2015, aiming to collect 5 fb−1 with the upgraded KLOE-2 detector
Summary
-factory collected large samples of light mesons, providing precise knowledge of their decay dynamics. The → + − decay has been studied to search for a possible contribution from chiral anomaly, while a new preliminary high statistics Dalitz plot analysis of the → + − 0 will increase the accuracy of the light quark mass ratio. 2 , q22 > 0) in the kinematical region of interest for the VMD model. Detailed study of such decays has bee√n performed both for. Data collected at s = 1 GeV have been used to study hadron production in interactions, providing the most precise measurement of the ( → ) partial width
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