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

B Armbruster1, G Drexlin, K Eitel

  • 1Institut für Kernphysik, Forschungszentrum Karlsruhe, 76021 Karlsruhe, Germany.

Physical Review Letters
|June 6, 2003
PubMed
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This summary is machine-generated.

Researchers tested lepton flavor conservation by searching for electron neutrinos (nu(e)) from muon (mu(+)) decays. No signal was found, setting new limits on this decay and excluding a source for the LSND experiment signal.

Area of Science:

  • Particle Physics
  • Lepton Flavor Violation
  • Muon Decays

Background:

  • Lepton flavor conservation is a fundamental principle in particle physics.
  • Muon decays are a key area for testing this principle.
  • Previous experiments have searched for lepton flavor violating (LFV) decays, but with less stringent limits.

Purpose of the Study:

  • To test lepton flavor conservation by searching for electron neutrinos (nu(e)) produced in muon (mu(+)) decays at rest.
  • To set new upper limits on the branching ratio of the LFV decay mu(+) --> e(+) + nu(e) + nu(-) (antineutrino).
  • To constrain extensions of the Standard Model (SM) that allow for LFV processes.

Main Methods:

  • Utilized the ISIS beam stop target to produce muons (mu(+)) at rest.

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  • Searched for electron neutrinos (nu(e)) via the inverse beta decay reaction: p(nu(e), e(+))n.
  • Analyzed data to identify any signal indicative of LFV muon decays.

    • Main Results:

    • No signal for electron neutrinos (nu(e)) from LFV mu(+) decays was identified.
    • Established new upper limits for the branching ratio (BR) of mu(+) --> e(+) + nu(e) + nu(-): BR < 0.9(1.7) x 10(-3) at 90% confidence level.
    • These limits improve upon previous results by an order of magnitude.

    Conclusions:

    • The results strongly constrain extensions of the Standard Model that permit significant LFV muon decays.
    • The experiment excludes the decay mu(+) --> e(+) + nu(e) + nu(mu) as a potential source for the electron neutrino signal observed by the LSND experiment.
    • This study reinforces the validity of lepton flavor conservation within the tested parameters.