Willmann, Lorenz
[Author];
Schmidt, Peter Vaughan
[Author];
Grossmann, Alex
[Author];
Jungmann, Klaus
[Author];
Meyer, Volker
[Author];
Merkel, Jesko Friedrich
[Author];
Putlitz, Gisbert zu
[Author];
Reinhard, Irene
[Author];
Träger, Konrad
[Author]
New bounds from searching for muonium to antimuonium conversion
Description:
A new upper limit for the probability of spontaneous muonium to antimuonium conversion was established at ${\rm P_{M\bar{M}}} \leq 8.2 \cdot 10^{-11}$ (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 flavour diagonal bileptonic gauge boson can be significantly restricted. A Z$_8$ model with radiative mass generation through heavy lepton seed and the minimal version of 331-GUT models are ruled out.