English (United Kingdom)

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We analyze the flavor violating muon decay $\mu\rightarrow e\chi$, where$\chi$ is a massive gauge boson, with emphasis in the regime where $\chi$ isultralight. We first study this process from an effective field theorystandpoint in terms of form factors. We then present two explicit models where$\mu\rightarrow e\chi$ is generated at tree level and at the one-loop level. Wealso comment on the prospects of observing the process $\mu\rightarrow e\chi$in view of the current limits on $\mu\rightarrow 3e$ from the SINDRUMcollaboration.

Flavor violating muon decay into an electron and a light gauge boson