Publication Title

Physical Review C

Publication Date

3-2009

Document Type

Article

DOI

10.1103/PhysRevC.79.035204

Keywords

slope parameter α for the η→3π0 decay, Crystal Ball detector, Mainz Microtron, MAMI-C

Disciplines

Physics

Abstract

The dynamics of the η→3π0 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 η-meson production. The analysis of 3×106 γp→ηp→3π0p→6γp events yields the value α=−0.032±0.003 for the η→3π0 slope parameter, which agrees with the majority of recent experimental results and has the smallest uncertainty. The π0π0invariant-mass spectrum was investigated for the occurrence of a cusplike structure in the vicinity of the π+π− threshold. The observed effect is small and does not affect our measured value for the slope parameter.


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