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Measurement of the slope parameter α for the ηto 3π⁰ decay at KLOE

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arxiv 0707.4137 v1 pith:55PVBUTN submitted 2007-07-27 hep-ex

Measurement of the slope parameter α for the ηto 3π⁰ decay at KLOE

classification hep-ex
keywords alphadecayparameterkloemeasurementslopeapproachcalculations
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We report a preliminary measurement of the slope parameter $\alpha$ for the $\eta\to 3\piz$ decay carried out with KLOE at DA$\Phi$NE; where $\alpha$ is the parameter describing the energy dependence of the square of the matrix element for this decay. By fitting the event density in the Dalitz plot with a collected statistic of 420 pb$^{-1}$ we determine $\alpha = -0.027 \pm 0.004 (stat) ^{+0.004}_{-0.006} (syst)$. This result is consistent with current chiral perturbation theory calculations within the unitary approach.

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