About the end of the electron spectrum in five-lepton $μ^+$ decay
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The spectrum of very fast electrons in five-lepton decay $μ^+\to e^-e^+e^+ν\barν,$ that is the main background decay at the study of the muonium-antimuonium conversion in vacuum, is considered. The essential decrease of the spectral distribution is demonstrated when the energy of one positron in this decay is small. Some arguments for such decrease for arbitrary positron energies are given.
6p, submitted to JETP Lett
6p, submitted to JETP Lett