Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2003-02-14
Phys.Rev.Lett. 90 (2003) 181804
Physics
High Energy Physics
High Energy Physics - Experiment
10 pages, including 1 figure, 1 table
Scientific paper
10.1103/PhysRevLett.90.181804
We investigated mu+ decays at rest produced at the ISIS beam stop target. Lepton flavor (LF) conservation has been tested by searching for \nueb via the detection reaction p(\nueb,e+)n. No \nueb signal from LF violating mu+ decays was identified. We extract upper limits of the branching ratio for the LF violating decay mu+ -> e+ \nueb \nu compared to the Standard Model (SM) mu+ -> e+ nue numub decay: BR < 0.9(1.7)x10^{-3} (90%CL) depending on the spectral distribution of \nueb characterized by the Michel parameter rho=0.75 (0.0). These results improve earlier limits by one order of magnitude and restrict extensions of the SM in which \nueb emission from mu+ decay is allowed with considerable strength. The decay \mupdeb as source for the \nueb signal observed in the LSND experiment can be excluded.
Armbruster Benjamin
Blair I. M.
Bodmann B. A.
Booth N. E.
Drexlin Guido
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