Magnetic Field Dependence of Muonium-antimuonium Conversion

We study the magnetic field dependence of muonium–antimuonium conversion induced by neutral (pseudo)scalar bosons. Only the $SS$ operator contributes to the conversion of polarized muonium, but it gets quenched by a magnetic field of strength 0.1 Gauss or stronger. Conversion induced by $SS$ couplings for unpolarized muonium is independent of magnetic field. Magnetic fields of 0.1 Tesla or stronger starts to suppress conversion induced by $PP$ interactions in the lowest Breit-Rabi level, but gets partially compensated by a rise in conversion probability in the other unpolarized level. The effects of $(S\mp P)(S\mp P)$and$(S\mp P)(S\pm P)$operatorsbehaveinthesamewayas$(V\mp A)(V\mp A)$and$(V\mp A)(V\pm A)$ operators, respectively.