Measurement of the $\eta\to 3\pi^{0}$ slope parameter $\alpha$ with the KLOE detector

TL;DR

This paper reports a precise measurement of the slope parameter alpha in the eta to 3 pi0 decay using the KLOE detector, providing results consistent with recent experimental findings.

Contribution

First measurement of the eta to 3 pi0 decay slope parameter alpha using a large, background-free dataset at the KLOE experiment.

Findings

Measured alpha = -0.0301 ± 0.0035 (stat) ± 0.0035 (syst)

Result agrees with recent hadro- and photo-production experiments

Utilized a dataset of approximately 17 million eta mesons

Abstract

We present a measurement of the slope parameter $\alpha$ for the $\eta\to 3\pi^{0}$ decay, with the KLOE experiment at the DA$\Phi$NE $\phi$-factory, based on a background free sample of $\sim$ 17 millions $\eta$ mesons produced in $\phi$ radiative decays. By fitting the event density in the Dalitz plot we determine $\alpha = -0.0301 \pm 0.0035\,stat\;_{-0.0035}^{+0.0022}\,syst\,$. The result is in agreement with recent measurements from hadro- and photo-production experiments.