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26 April 2024

» arxiv » 1409.0638

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A search for two body muon decay signals
R. Bayes ; J. Bueno ; Yu. I. Davydov ; P. Depommier ; W. Faszer ; M. C. Fujiwara ; C. A. Gagliardi ; A. Gaponenko ; D. R. Gill ; A. Grossheim ; P. Gumplinger ; M. D. Hasinoff ; R. S. Henderson ; A. Hillairet ; J. Hu ; D. D. Koetke ; R. P. MacDonald ; G. M. Marshall ; E. L. Mathie ; R. E. Mischke ; K. Olchanski ; A. Olin ; R. Openshaw ; J.-M. Poutissou ; R. Poutissou ; V. Selivanov ; G. Sheffer ; B. Shin ; T. D. S. Stanislaus ; R. Tacik ; R. E. Tribble ;
Date:	2 Sep 2014
Abstract:	Lepton family number violation is tested by searching for $mu^+ o e^+X^0$ decays among the 5.8$ imes 10^8$ positive muon decay events analyzed by the TWIST collaboration. Limits are set on the production of both massless and massive $X^0$ bosons. The large angular acceptance of this experiment allows limits to be placed on anisotropic $mu^+ o e^+X^0$ decays, which can arise from interactions violating both lepton flavor and parity conservation. Branching ratio limits of order $10^{-5}$ are obtained for boson masses of 10 - 80 MeV/c$^2$ and different asymmetries. For lighter bosons the asymmetry dependence is much stronger and the branching ratio limit varies up to $5.8 imes 10^{-5}$. This is the first study that explicitly evaluates the limits for anisotropic two body muon decays.
Source:	arXiv, 1409.0638
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