Abstract
We present the status of an ongoing analysis of the eta -> pi(+)pi(-)pi(0) Dalitz plot, as well as preliminary results for the Dalitz plot parameters. The analysis is based on data taken at the DA Phi NE phi-factory with the KLOE detector.
Highlights
Chiral Perturbation Theory (PT) calculations for the decay width the of → + − 0 process, at leading order LO ∼ 70 eV and next to leading order NLO = 160 ± 50 eV, do not agree with the experimental value exp = 296 ± 16 eV [1]
The Dalitz plot of → + − 0 shows the dymanics of the decay and can be used either to compare to PT calculations, or as input to dispersive analysis calculations with the aim of extracting Q ([3], [4])
In 2008, the KLOE collaboration published a Dalitz plot analysis of this decay performed on pb−1, with the largest statistics to date, 1.34 · 106 events in the Dalitz plot [5], but more data is needed to understand the tension between experimental results and PT calculations
Summary
Chiral Perturbation Theory (PT) calculations for the decay width the of → + − 0 process, at leading order LO ∼ 70 eV and next to leading order NLO = 160 ± 50 eV, do not agree with the experimental value exp = 296 ± 16 eV [1]. This points towards important effects from pion rescattering in the final state, which can be treated by means of dispersion relations [2].
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