Eur. Phys. J. C (2007) 49: 473-488
https://doi.org/10.1140/epjc/s10052-006-0157-7

Regular Article - Experimental Physics

Dalitz plot analysis of e⁺e^-→π⁰π⁰γ events at with the KLOE detector

¹ Institute of High Energy Physics, Academica Sinica, Beijing, China
² Laboratori Nazionali di Frascati dell’INFN, Frascati, Italy
³ Institut für Experimentelle Kernphysik, Universität Karlsruhe, Karlsruhe, Germany
⁴ Dipartimento di Fisica, Università e Sezione INFN, Lecce, Italy
⁵ Institute for Theoretical and Experimental Physics, Moscow, Russia
⁶ Dipartimento di Scienze Fisiche, Università “Federico II” e Sezione INFN, Napoli, Italy
⁷ Dipartimento di Fisica, Università e Sezione INFN, Pisa, Italy
⁸ Dipartimento di Energetica, Università “La Sapienza”, Roma, Italy
⁹ Dipartimento di Fisica, Università “La Sapienza” e Sezione INFN, Roma, Italy
¹⁰ Dipartimento di Fisica, Università “Tor Vergata” e Sezione INFN, Roma, Italy
¹¹ Dipartimento di Fisica, Università “Roma Tre” e Sezione INFN, Roma, Italy
¹² Physics Department, State University of New York, Stony Brook, USA
¹³ Physics Department, University of Virginia, Charlottesville, USA

^* e-mail: simona.giovannella@lnf.infn.it

Received: 5 September 2006
Published online: 9 December 2006

Abstract

We have studied the Dalitz plot of the e⁺e^-→π⁰π⁰γ events (N_π0π0γ∼65000) collected at with the KLOE detector. In the dipion invariant mass (M_ππ) region below 700 MeV, the process under study is dominated by the non-resonant process e⁺e^-→ωπ⁰ with ω→π⁰γ whereas, for higher M_ππ values, the radiative φ decay to the f₀(980) is the dominant mechanism. Different theoretical models are used to fit the Dalitz plot, taking also into account a possible contribution of the σ(600). For each model, we extract the f₀(980) mass and its coupling to ππ, KK̄ and to the φ.