Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2008-12-10
Phys.Rev. C79, 035204 (2009)
Physics
High Energy Physics
High Energy Physics - Experiment
Scientific paper
10.1103/PhysRevC.79.035204
The dynamics of the $\eta\to 3\pi^0$ decay have been studied with the Crystal Ball multiphoton spectrometer and the TAPS calorimeter. Bremsstrahlung photons produced by the 1.5-GeV electron beam of the Mainz microtron MAMI-C and tagged by the Glasgow photon spectrometer were used for $\eta$-meson production. The analysis of $3 \times 10^6$ $\gamma p \to \eta p \to 3\pi^0 p \to 6\gamma p$ events yields the value $\alpha=-0.032\pm0.003$ for the $\eta\to 3\pi^0$ slope parameter, which agrees with the majority of recent experimental results and has the smallest uncertainty. The $\pi^0\pi^0$ invariant-mass spectrum was investigated for the occurrence of a cusplike structure in the vicinity of the $\pi^+\pi^-$ threshold. The observed effect is small and does not affect our measured value for the slope parameter.
Aguar-Bartolome P.
Akasoy L. K.
Annand J. R. M.
Arends H.-J.
Bantawa K.
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