http://arxiv.org/abs/2012.01504
Experiments looking for a lepton flavor-violating decay $\mu^{+}!!\rightarrow !e^{+} X^{0}$ are reviewed in light of present-day germanium detector technology, with an eye on scenarios where a long-lived, slow-moving massive boson $X^{0}$ might have a cosmological impact. A broad swath of interesting, unexplored parameter space very close to the kinematic limit of the decay is found to be within the reach of a new proposed search. A number of possible roles for $X^{0}$ in past and present epochs can be investigated.
J. Collar
Fri, 4 Dec 20
14/77
Comments: 5 pages, 4 figures. Version submitted to Phys. Rev. D
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