Magnetic field dependence of muonium-antimuonium conversion

We study the magnetic field dependence of muonium-antimuonium conversion for all relevent operators, such as (V − A) (V − A), (V − A) (V + A), SS and PP. The traditional (V − A) (V − A) interaction suffers two stage quenching and becomes strongly suppressed by 103 Gauss fields or higher. In contrast, all other operator types (except (S − P) (S − P)) have a weaker field dependence and in general are not strongly quenched by strong fields. Since ongoing experiments are done with sizable magnetic fields, our results are useful for the interpretation of experimental results as bounds on different effective interactions.