Observation of a multiparticle event with two isolated energetic muons in e^+e^- interactions - CELLO Collaboration; Behrend, H.-J.; Burger, J.; Criegee, L.; Fenner, H.; Franke, G.; Meyer, J.; Schroder, V.; Cordier, A.; Gaidot, A.; Campbell, A.J.; Forstbauer, B.; et al. (Elsevier)
An event from e^+e^- annihilation at √s = 43.450 GeV containing two topologically isolated energetic muons and two hadronic jets has been observed. The masses of the μ-μ, jet-jet and μ-jet combinations are all large. The expected number of such events from known processes is about 10^-^3.
http://linkinghub.elsevier.com/retrieve/pii/0370-2693(84)90578-1
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