We have observed exclusive decays of the psi' in an experiment where the psi' is formed in antiproton-proton annihilations. We report the branching ratios B(psi' --> e(+)e(-)) = (8.3 +/- 0.5(stat) +/- 0.7(syst)) x 10(-3), B(psi' --> J/psi pi(+)pi(-)) = 0.283 +/- 0.021(stat) +/- 0.020(syst), B(psi' --> J/psi pi(0) pi(0)) = 0.184 +/- 0.019(stat) +/- 0.013(syst), B(pi' --> J/psi eta) = 0.032 +/- 0.010(stat) +/- 0.002(syst).
Measurement of the branching ratios psi'->e(+)e(-), psi'->J/psi pi pi, and psi'->J/psi eta
MENICHETTI, Ezio;
1997-01-01
Abstract
We have observed exclusive decays of the psi' in an experiment where the psi' is formed in antiproton-proton annihilations. We report the branching ratios B(psi' --> e(+)e(-)) = (8.3 +/- 0.5(stat) +/- 0.7(syst)) x 10(-3), B(psi' --> J/psi pi(+)pi(-)) = 0.283 +/- 0.021(stat) +/- 0.020(syst), B(psi' --> J/psi pi(0) pi(0)) = 0.184 +/- 0.019(stat) +/- 0.013(syst), B(pi' --> J/psi eta) = 0.032 +/- 0.010(stat) +/- 0.002(syst).
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