Measurement of the slope parameter α for the ηto 3π⁰ decay at KLOE

KLOE collaboration: F. Ambrosino , A. Antonelli , M. Antonelli , F. Archilli , C. Bacci , P. Beltrame , G. Bencivenni , S. Bertolucci

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C. Bini C. Bloise S. Bocchetta V. Bocci F. Bossi P. Branchini R. Caloi P. Campana G. Capon T. Capussela F. Ceradini S. Chi G. Chiefari P. Ciambrone E. De Lucia A. De Santis P. De Simone G. De Zorzi A. Denig A. Di Domenico C. Di Donato S. Di Falco B. Di Micco A. Doria M. Dreucci G. Felici A. Ferrari M.L. Ferrer G. Finocchiaro S. Fiore C. Forti P. Franzini C. Gatti P. Gauzzi S. Giovannella E. Gorini E. Graziani M. Incagli W. Kluge V. Kulikov F. Lacava G. Lanfranchi J. Lee-Franzini D. Leone M. Martini P. Massarotti W. Mei S. Meola S. Miscetti M. Moulson S. M\"uller F. Murtas M. Napolitano F. Nguyen M. Palutan E. Pasqualucci A. Passeri V. Patera F. Perfetto M. Primavera P. Santangelo G. Saracino B. Sciascia A. Sciubba F. Scuri I. Sfiligoi T. Spadaro M. Testa L. Tortora P. Valente B. Valeriani G. Venanzoni R. Versaci G. Xu

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classification ✦ hep-ex

keywords alphadecayparameterkloemeasurementslopeapproachcalculations

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We report a preliminary measurement of the slope parameter $\alpha$ for the $\eta\to 3\piz$ decay carried out with KLOE at DA$\Phi$NE; where $\alpha$ is the parameter describing the energy dependence of the square of the matrix element for this decay. By fitting the event density in the Dalitz plot with a collected statistic of 420 pb$^{-1}$ we determine $\alpha = -0.027 \pm 0.004 (stat) ^{+0.004}_{-0.006} (syst)$. This result is consistent with current chiral perturbation theory calculations within the unitary approach.

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Measurement of the slope parameter α for the ηto 3π⁰ decay at KLOE

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