Abstract
A precise measurement of the Dalitz plot parameter, \( \alpha\) , for the \( \eta\) → 3\( \pi^{0}_{}\) decay is presented. The experiment was performed with the Crystal Ball and TAPS large-acceptance photon detectors at the tagged photon beam facility of the MAMI-B electron accelerator in Mainz. High statistics of 1.8 · 106 \( \eta\) → 3\( \pi^{0}_{}\) events were obtained, giving the result \( \alpha\) = - 0.032±0.002stat±0.002syst .
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Crystal Ball at MAMI, TAPS and A2 Collaborations., Unverzagt, M., Aguar-Bartolomé, P. et al. Determination of the Dalitz plot parameter \( \alpha\) for the decay \( \eta\) → 3\( \pi^{0}_{}\) with the Crystal Ball at MAMI-B. Eur. Phys. J. A 39, 169–177 (2009). https://doi.org/10.1140/epja/i2008-10710-7
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DOI: https://doi.org/10.1140/epja/i2008-10710-7