Measurement of Prominent eta Decay Branching Fractions

Details Measurement of Prominent eta Decay Branching Fractions Measurement of Prominent eta Decay Branching Fractions

2007-07-11

arxiv.org/abs/0707.1601v1

Phys.Rev.Lett.99:122001,2007

Physics

High Energy Physics

High Energy Physics - Experiment

11 pages postscript,also available through http://www.lns.cornell.edu/public/CLNS/2007/, Submitted to PRL

Scientific paper

10.1103/PhysRevLett.99.122001

The decay psi(2S) --> eta J/psi is used to measure, for the first time, all prominent eta-meson branching fractions with the same experiment in the same dataset, thereby providing a consistent treatment of systematics across branching fractions. We present results for eta decays to gamma gamma, pi+pi-pi0, 3 pi0, pi+ pi- gamma, and e+ e- gamma, accounting for 99.9% of all eta decays. The precisions for several of the branching fractions and their ratios are improved. Two channels, pi+ pi- gamma and e+ e- gamma, show results that differ at the level of three standard deviations from those previously determined.

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