We report the first observation of the (radiative) decay J/psi-->e(+)e(-)gamma. Our data are from an experiment in which J/psi is formed in antiproton-proton annihilations. The observed rate is consistent with a QED calculation based on final state radiation. Our measurement gives a branching ratio for this mode of (8.8 +/- 1.3 +/- 0.4) x 10(-3) for gamma energy > 100 MeV.
Observation of the radiative decay J/psi->e(+)e(-)gamma
MENICHETTI, Ezio;
1996-01-01
Abstract
We report the first observation of the (radiative) decay J/psi-->e(+)e(-)gamma. Our data are from an experiment in which J/psi is formed in antiproton-proton annihilations. The observed rate is consistent with a QED calculation based on final state radiation. Our measurement gives a branching ratio for this mode of (8.8 +/- 1.3 +/- 0.4) x 10(-3) for gamma energy > 100 MeV.
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