Precision measurement of the $\eta\to\pi^+\pi^-\pi^0$ Dalitz plot   distribution with the KLOE detector
  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. 
KLOE-2 Collaboration: A. Anastasi, D. Babusci, G. Bencivenni, M.   Berlowski, C. Bloise, F. Bossi, P. Branchini, A. Budano, ...
hep-ex nucl-ex