Observation of a multiparticle event with two isolated energetic muons in e+e- interactions

Abstract 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 .