Abstract: A search for two exotic decay modes of the ϒ(1S) meson has been made using the ARGUS detector at the e+e− storage ring DORIS II at DESY. The first was ϒ(1S) decays into weakly interacting particles, for which an upper limit of 2.3% at the 90% CL on the branching ratio is found. The second mode was ϒ(1S)→γa, where a is a neutral particle with mass less than 1.5GeV/c2, that either decays inside the detector or is sufficiently long-lived to escape detection. For short-lived particles a decaying into an e+e− pair, upper limits on the BR(ϒ(1S)→γa) of 3.1 × 10− at the 90% CL are found. The upper limit without restriction on the lifetime of a is found to be 1.3 × 10−3. Limits for other decay modes are also given.
Publication Year: 1986
Publication Date: 1986-10-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 26
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