Measurement of the eta->pi+pi-e+e- decay branching ratio

Details Measurement of the eta->pi+pi-e+e- decay branching ratio Measurement of the eta->pi+pi-e+e- decay branching ratio

2006-09-06

arxiv.org/abs/hep-ex/0609007v2

Phys.Lett.B644:299-303,2007

Physics

High Energy Physics

High Energy Physics - Experiment

10 pages,6 figures revised version

Scientific paper

10.1016/j.physletb.2006.12.008

The reaction pd->3He eta at threshold was used to provide a clean source of
eta mesons for decay studies with the WASA detector at CELSIUS. The branching
ratio of the decay eta->pi+pi-e+e- is measured to be (4.3+/-1.3+/-0.4)x10^-4.

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