Results from Searching for Muonium to Antimuonium Conversion

Abstract

A new result from searching for muonium to antimuonium conversion is reported which sets an upper limit on the coupling constant in an assumed $(V-A)\times (V-A)$ type interaction of $G_{M\bar{M}}\le 3\cdot 10^{-3}{G}_F$ ~ (90% C.L.). A particular Z_8 and a minimal 331 GUT model can be ruled out. Further new and stringent limits can be set for masses of bileptonic gauge bosons and $\hat{I}»$ parameters in R-parity breaking supersymmetric models.

submitted to proceedings of "6TH CONFERENCE ON PARTICLES, STRINGS AND COSMOLOGY",, Boston (1998)