Noordmans, J. P.Onderwater, C. J. G.Wilschut, H. W.Timmermans, R. G. E.2017-04-072017-04-072016-062470-0010http://hdl.handle.net/10400.1/9430Possibilities to test the Lorentz invariance of the weak interaction in muon decay are considered. We derive the direction-dependent muon-decay rate with a general Lorentz-violating addition to the W-boson propagator. We discuss measurements of the directional and boost dependence of the Michel parameters and of the muon lifetime as a function of absolute velocity. The total muon-decay rate in the Lorentz-violating standard model extension is addressed. Suggestions are made for dedicated (re) analyses of the pertinent data and for future experiments.engjournal article10.1103/PhysRevD.93.116001