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Abstract

We demonstrate the feasibility of probing the charged lepton-flavor-violating decay μ+ → e+X0 for the presence of a slow-moving neutral boson X0 capable of undergoing gravitational binding to large structures and, as such, able to participate in some cosmological scenarios. A short exposure to surface antimuons from beam line M20 at TRIUMF generates a branching ratio limit of ≲10−5. This is comparable to or better than previous searches for this channel, although in a thus-far-unexplored region of X0 phase space very close to the kinematic limit of the decay, where mX0 approaches mμ+. The future improved sensitivity of the method using a customized p-type point-contact germanium detector is described.

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