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25 April 2024

» arxiv » hep-ex/0302017

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Improved limits on nuebar emission from mu+ decay
B. Armbruster ; I.M. Blair ; B.A. Bodmann ; N.E. Booth ; G. Drexlin ; J.A. Edgington ; C. Eichner ; K. Eitel ; E. Finckh ; H. Gemmeke ; J. Hössl ; T. Jannakos ; P. Jünger ; M. Kleifges ; J. Kleinfeller ; W. Kretschmer ; R. Maschuw ; C. Oehler ; P. Plischke ; J. Reichenbacher ; C. Ruf ; M. Steidl ; J. Wolf ; B. Zeitnitz ;
Date:	14 Feb 2003
Journal:	Phys.Rev.Lett. 90 (2003) 181804
Subject:	hep-ex
Abstract:	We investigated mu+ decays at rest produced at the ISIS beam stop target. Lepton flavor (LF) conservation has been tested by searching for ueb via the detection reaction p( ueb,e+)n. No ueb signal from LF violating mu+ decays was identified. We extract upper limits of the branching ratio for the LF violating decay mu+ -> e+ ueb u 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 ueb 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 ueb emission from mu+ decay is allowed with considerable strength. The decay mupdeb as source for the ueb signal observed in the LSND experiment can be excluded.
Source:	arXiv, hep-ex/0302017
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