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Improved limits on nu(e) emission from mu+ decay.
MedLine Citation:
PMID:  12786000     Owner:  NLM     Status:  PubMed-not-MEDLINE    
We investigated mu(+) decays at rest produced at the ISIS beam stop target. Lepton flavor (LF) conservation has been tested by searching for nu(e) via the detection reaction p(nu(e),e(+))n. No nu(e) signal from LF violating mu(+) decays was identified. We extract upper limits of the branching ratio (BR) for the LF violating decay mu(+)-->e(+)+nu(e)+nu(-) compared to the standard model (SM) mu(+)-->e(+)+nu(e)+nu(mu) decay: BR<0.9(1.7) x 10(-3) (90% C.L.) depending on the spectral distribution of nu(e) 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 nu(e) emission from mu(+) decay is allowed with considerable strength. The decay mu(+)-->e(+)+nu(e)+nu(mu) often proposed as a potential source for the nu(e) signal observed in the LSND experiment can be excluded.
B Armbruster; G Drexlin; K Eitel; T Jannakos; J Kleinfeller; R Maschuw; C Oehler; P Plischke; J Reichenbacher; M Steidl; B Zeitnitz; H Gemmeke; M Kleifges; C Eichner; C Ruf; B A Bodmann; E Finckh; J Hössl; P Jünger; W Kretschmer; J Wolf; N E Booth; I M Blair; J A Edgington
Publication Detail:
Type:  Journal Article     Date:  2003-05-09
Journal Detail:
Title:  Physical review letters     Volume:  90     ISSN:  0031-9007     ISO Abbreviation:  Phys. Rev. Lett.     Publication Date:  2003 May 
Date Detail:
Created Date:  2003-06-05     Completed Date:  2003-07-17     Revised Date:  2003-11-04    
Medline Journal Info:
Nlm Unique ID:  0401141     Medline TA:  Phys Rev Lett     Country:  United States    
Other Details:
Languages:  eng     Pagination:  181804     Citation Subset:  -    
Institut für Kernphysik, Forschungszentrum Karlsruhe, 76021 Karlsruhe, Germany.
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