Bochum 2009 – wissenschaftliches Programm

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HK: Fachverband Hadronen und Kerne

HK 47: Hadron Structure and Spectroscopy II

HK 47.7: Gruppenbericht

Mittwoch, 18. März 2009, 15:30–16:00, H-ZO 30

Results in hadronic physics with the KLOE experiment in Frascati — •Stefan E. Müller — Institut für Kernphysik Universität Mainz, J.-J.-Becher-Weg 45, 55128 Mainz

The KLOE experiment at the DAΦNE e⁺e⁻ collider in Frascati covers a wide spectrum of physics. Concerning hadronic physics, a new precise measurement of the pion form factor in the mass range between 0.35 and 0.95 GeV² has been published recently, selecting events in which the e⁺ or the e⁻ emits a hard photon in the initial state. This “radiative return” to the ρ and ω resonances allows to access the energy region below the DAΦNE energy, which is fixed to M_φ≃1.02 GeV. In addition, new results have been obtained in the scalar sector, like an upper limit on the branching ratio for φ → K₀K₀γ, which proceeds through f₀(980)/a₀(980)γ, and a high statistics result on the φ → a₀γ decay. For η/η′ physics, a final result for the η→π⁺π⁻e⁺e⁻ branching ratio has been obtained, while the KLOE measurement of the gluonium content of the η′ has been updated. Also, the cross section parameters for the processes e⁺e⁻ → π⁺π⁻π⁰π⁰ and e⁺e⁻ → π⁰π⁰γ, which both proceed through the ωπ⁰ intermediate state, have been measured. In the talk, these new KLOE results will be presented, and a brief overview on ongoing KLOE analyses in hadronic physics will be given.