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Subject Keyword PHYSICS ♦ J PSI-3097 MESONS ♦ RADIATIVE DECAY ♦ ELECTRONS ♦ POSITRONS ♦ PROTON-ANTIPROTON INTERACTIONS ♦ ANNIHILATION ♦ BRANCHING RATIO
Abstract We report the first observation of the (radiative) decay {ital J}/{psi}{r_arrow}{ital e}{sup +}{ital e}{sup {minus}}{gamma}. Our data are from an experiment in which {ital 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{plus_minus}1.3{plus_minus}0.4){times}10{sup {minus}3} for {gamma} energy{gt}100 MeV. {copyright} {ital 1996 The American Physical Society.}
ISSN 05562821
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-12-01
Publisher Place United States
Journal Physical Review, D
Volume Number 54
Issue Number 11


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