Published in:
Physical Review Letters 99,12 (2007)
Link to original published article:
http://dx.doi.org/10.1103/PhysRevLett.99.122001
Abstract
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(-)pi(0), 3 pi(0), pi(+)pi(-)gamma and e(+)e(-)gamma, accounting for 99.9% of all eta decays. The precision of several of the branching fractions and their ratios is 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.
Keywords
Physics, Multidisciplinary
Date of this Version
January 2007