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

The 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 F. Bossi P. Branchini R. Caloi P. Campana G. Capon T. Capussela F. Ceradini F. Cesario S. Chi G. Chiefari P. Ciambrone F. Crucianelli E. De Lucia A. De Santis P. De Simone G. De Zorzi A. Denig A. Di Domenico C. Di Donato B. Di Micco A. Doria M. Dreucci G. Felici A. Ferrari M. L. Ferrer S. Fiore C. Forti P. Franzini C. Gatti P. Gauzzi S. Giovannella E. Gorini E. Graziani 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 A. Sibidanov T. Spadaro M. Testa L. Tortora P. Valente G. Venanzoni R. Versaci G. Xu

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classification ✦ hep-ex

keywords decaykloedalitzdetectorobtainplotslopesalternative

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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 $\eta$ mesons from the decay $\phi\to\eta\gamma$ for an integrated luminosity ${\mathcal L}$ = 450 pb$^{-1}$. From a fit to the Dalitz plot density distribution we obtain a precise measurement of the slope parameters. An alternative parametrization relates the $\pi^+\pi^-\pi^0$ slopes to that for $\eta\to 3\pi^0$ showing the consistency of KLOE results for both channels. We also obtain the best confirmation of the $C$-invariance in the $\eta\to\pi^+\pi^-\pi^0$ decay.

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

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