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Can a neutron, if it has enough kinetic energy, decay like:

$ \hspace{0.3cm} n \rightarrow p + \mu^- + \bar{\nu}_\mu $

I assume it's not allowed since it's not on the possible decay modes on the Particle Data Group (http://pdg.lbl.gov/), but I don't know if they only account decays allowed from rest masses.

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Kinetic energy does not matter. In its own frame, the neutron does not have enough mass/energy to decay in a proton and a muon.

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