Determination of the ηtoπ^+π^-π⁰ Dalitz Plot slopes and asymmetries with the KLOE detector

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 decayasymmetriesdalitzdetectorkloeplotallowamplitude

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We have studied, with the KLOE detector at the DA$\Phi$NE $\Phi$-Factory, the dynamics of the decay $\eta\to\pi^+\pi^-\pi^0$ using data from the radiative $\phi\to\eta\gamma$ decay for an integrated luminosity $L = 450 \textrm{pb^{-1}}$. From a fit to the Dalitz plot density distribution we obtain a precise measurement of the slope parameters. This should allow to improve the knowledge of the decay amplitude which is sensitive to the u-d quark mass difference. We also present new best results on the C-violating asymmetries in the $\eta\to\pi^+\pi^-\pi^0$ decay.

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Determination of the ηtoπ^+π^-π⁰ Dalitz Plot slopes and asymmetries with the KLOE detector

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