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Measurement of the ηto 3π⁰ slope parameter α with the KLOE detector

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arxiv 1004.1319 v1 pith:66NZNNZI submitted 2010-04-08 hep-ex

Measurement of the ηto 3π⁰ slope parameter α with the KLOE detector

classification hep-ex
keywords alphakloemeasurementparameterslopeagreementbackgrounddalitz
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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