Determination of the η\toπ^+π^-π^0 Dalitz Plot slopes and asymmetries with the KLOE detector

Abstract

We have studied, with the KLOE detector at the DA$\hat{I}¦$NE $\hat{I}¦$-Factory, the dynamics of the decay $\hat{I}\cdot \to \ddot{I}{€}^{+}\ddot{I}{€}^{-}\ddot{I}{€}^0$ using data from the radiative $\ddot{I}•\to \hat{I}\cdot {\hat{I}}^3$ 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 $\hat{I}\cdot \to \ddot{I}{€}^{+}\ddot{I}{€}^{-}\ddot{I}{€}^0$ decay.

" Contributed paper to Lepton-Photon 2007 ", 19 pages, 7 figures