Measurement of the ηto 3π⁰ slope parameter α with the KLOE detector

F. Ambrosino , A. Antonelli , M. Antonelli , F. Archilli , P. Beltrame , G. Bencivenni , C. Bini , C. Bloise

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S. Bocchetta F. Bossi P. Branchini P. Campana G. Capon T. Capussela F. Ceradini P. Ciambrone E. De Lucia A. De Santis P. De Simone G. De Zorzi A. Denig A. Di Domenico C. Di Donato B. Di Micco M. Dreucci G. Felici A. Ferrari S. Fiore P. Franzini C. Gatti P. Gauzzi S. Giovannella M. Jacewicz W. Kluge V. Kulikov J. Lee-Franzini M. Martini P. Massarotti S. Meola S. Miscetti M. Moulson S. M\"uller F. Murtas M. Napolitano F. Nguyen M. Palutan A. Passeri V. Patera F. Perfetto P. Santangelo B. Sciascia A. Sciubba T. Spadaro C. Taccini L. Tortora P. Valente G. Venanzoni R.Versaci G. Xu

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classification ✦ hep-ex

keywords alphakloemeasurementparameterslopeagreementbackgrounddalitz

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We present a measurement of the slope parameter $\alpha$ for the $\eta\to 3\pi^{0}$ decay, with the KLOE experiment at the DA$\Phi$NE $\phi$-factory, based on a background free sample of $\sim$ 17 millions $\eta$ mesons produced in $\phi$ radiative decays. By fitting the event density in the Dalitz plot we determine $\alpha = -0.0301 \pm 0.0035\,stat\;_{-0.0035}^{+0.0022}\,syst\,$. The result is in agreement with recent measurements from hadro- and photo-production experiments.

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Measurement of the ηto 3π⁰ slope parameter α with the KLOE detector

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