Phys. Rev. D 65, 112001 (2002) [16 pages]Upper limits for neutrino oscillations ν̅ μ→ν̅ e from muon decay at restReceived 8 March 2002; published 5 June 2002 The KARMEN experiment at the spallation neutron source ISIS used ν̅ μ from μ+ decay at rest for the search of neutrino oscillations ν̅ μ→ν̅ e in the appearance mode, with p(ν̅ e,e+)n as a detection reaction of ν̅ e. In total, 15 candidates satisfy all conditions for the ν̅ e signature, in agreement with the background expectation of 15.8±0.5 events, yielding no indication for oscillations. A single event based likelihood analysis leads to upper limits on the oscillation parameters sin2(2Θ)<1.7×10-3 for Δm2>~100 eV2 and Δm2<0.055 eV2 for sin2(2Θ)=1 at 90% confidence. Thus, KARMEN does not confirm the LSND experiment and restricts significantly its favored parameter region for ν̅ μ→ν̅ e. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.65.112001
DOI:
10.1103/PhysRevD.65.112001
PACS:
14.60.St, 14.60.Pq, 25.30.Pt
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