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Improved limits on anti-nu(e) emission from mu+ decay

Feb, 2003

10 pages

Published in:

Phys.Rev.Lett. 90 (2003) 181804

e-Print:

hep-ex/0302017 [hep-ex]

DOI:

10.1103/PhysRevLett.90.181804

View in:

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Abstract:

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.

muon+: leptonic decay
at rest
flavor: violation
antineutrino/e: search for
antineutrino nucleon: inelastic scattering
muon+: branching ratio
upper limit
spectral representation
Michel parameter
calorimeter: experimental results

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