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28 March 2024
 
  » pubmed » pmid12786000

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Improved limits on nu(e) emission from mu+ decay
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 ;
Date 9 May 2003
Journal Phys Rev Lett, 90 (18), 181804
AbstractWe 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.
Source PubMed, pmid12786000
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