New Bounds from a Search for Muonium to Antimuonium Conversion

Abstract
A new upper limit for the probability of spontaneous muonium to antimuonium conversion was established at PMM¯8.3×1011 ( 90% C.L.) in 0.1 T magnetic field, which implies consequences for speculative extensions to the standard model. Coupling parameters in R-parity-violating supersymmetry and the mass of a flavor diagonal bileptonic gauge boson can be significantly restricted. A Z8 model with radiative mass generation through heavy lepton seed and the minimal version of 331 models are disfavored.

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