Precision measurement of the ηtoπ^+π^-π⁰ Dalitz plot distribution with the KLOE detector

KLOE-2 Collaboration: A. Anastasi , D. Babusci , G. Bencivenni , M. Berlowski , C. Bloise , F. Bossi , P. Branchini , A. Budano

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L. Caldeira Balkest\r{a}hl B. Cao F. Ceradini P. Ciambrone F. Curciarello E. Czerwi\'nski G. D'Agostini E. Dan\'e V. De Leo E. De Lucia A. De Santis P. De Simone A. Di Cicco A. Di Domenico R. Di Salvo D. Domenici A. d'Uffizi A. Fantini G. Felici S. Fiore A. Gajos P. Gauzzi G. Giardina S. Giovannella E. Graziani F. Happacher L. Heijkenskj\"old W. Ikegami Andersson T. Johansson D. Kami\'nska W. Krzemien A. Kupsc S. Loffredo G. Mandaglio M. Martini M. Mascolo R. Messi S. Miscetti G. Morello D. Moricciani P. Moskal M. Papenbrock A. Passeri V. Patera E. Perez del Rio A. Ranieri P. Santangelo I. Sarra M. Schioppa M. Silarski F. Sirghi L. Tortora G. Venanzoni W. Wi\'slicki M. Wolke

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classification ✦ hep-ex nucl-ex

keywords dalitzplotdetectordistributionexpansionkloetermscdot

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Using $1.6$ fb$^{-1}$ of $e^+ e^-\to\phi\to\eta\gamma$ data collected with the KLOE detector at DA$\Phi$NE, the Dalitz plot distribution for the $\eta \to \pi^+ \pi^- \pi^0$ decay is studied with the world's largest sample of $\sim 4.7 \cdot 10^6$ events. The Dalitz plot density is parametrized as a polynomial expansion up to cubic terms in the normalized dimensionless variables $X$ and $Y$. The experiment is sensitive to all charge conjugation conserving terms of the expansion, including a $gX^2Y$ term. The statistical uncertainty of all parameters is improved by a factor two with respect to earlier measurements.

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Precision measurement of the ηtoπ^+π^-π⁰ Dalitz plot distribution with the KLOE detector

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