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  1. ; ; (, Physical Review Letters)
    We demonstrate the feasibility of probing the charged lepton-flavor-violating decay mu+ -> 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 <1E-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 m_X0 approaches m_mu+ . The future improved sensitivity of the method using a customized p-type point-contact germanium detector is described. 
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