Measurement of prominent eta-decay branching fractions.
Phys Rev Lett
; 99(12): 122001, 2007 Sep 21.
Article
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| MEDLINE
| ID: mdl-17930497
ABSTRACT
The decay psi(2S) --> etaJ/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), 3pi(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.
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MEDLINE
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En
Revista:
Phys Rev Lett
Año:
2007
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Article