Upper limits for neutrino oscillations ν¯μν¯e from muon decay at rest

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, and B. Zeitnitz (KARMEN Collaboration)
Phys. Rev. D 65, 112001 – Published 5 June 2002
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Abstract

The KARMEN experiment at the spallation neutron source ISIS used ν¯μ from μ+ decay at rest for the search of neutrino oscillations ν¯μν¯e in the appearance mode, with p(ν¯e,e+)n as a detection reaction of ν¯e. In total, 15 candidates satisfy all conditions for the ν¯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)<1.7×103 for Δm2>~100eV2 and Δm2<0.055eV2 for sin2(2Θ)=1 at 90% confidence. Thus, KARMEN does not confirm the LSND experiment and restricts significantly its favored parameter region for ν¯μν¯e.

  • Received 8 March 2002

DOI:https://doi.org/10.1103/PhysRevD.65.112001

©2002 American Physical Society

Authors & Affiliations

B. Armbruster1, I. M. Blair2, B. A. Bodmann3, N. E. Booth4, G. Drexlin1, J. A. Edgington2, C. Eichner5, K. Eitel1, E. Finckh3, H. Gemmeke6, J. Hößl3, T. Jannakos1, P. Jünger3, M. Kleifges6, J. Kleinfeller1, W. Kretschmer3, R. Maschuw1,5, C. Oehler1, P. Plischke1, J. Reichenbacher1, C. Ruf5, M. Steidl1, J. Wolf7, and B. Zeitnitz1,7 (KARMEN Collaboration)

  • 1Institut für Kernphysik, Forschungszentrum Karlsruhe, Postfach 3640, D-76021 Karlsruhe, Germany
  • 2Physics Department, Queen Mary, University of London, Mile End Road, London E1 4NS, United Kingdom
  • 3Physikalisches Institut, Universität Erlangen-Nürnberg, Erwin Rommel Strasse 1, D-91058 Erlangen, Germany
  • 4Department of Physics, University of Oxford, Keble Road, Oxford OX1 3RH, United Kingdom
  • 5Institut für Strahlen und Kernphysik, Universität Bonn, Nußallee 14-16, D-53115 Bonn, Germany
  • 6Institut für Prozessdatenverarbeitung und Elektronik, Forschungszentrum Karlsruhe, Postfach 3640, D-76021 Karlsruhe, Germany
  • 7Institut für experimentelle Kernphysik, Universität Karlsruhe, Gaedestrasse 1, D-76128 Karlsruhe, Germany

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Vol. 65, Iss. 11 — 1 June 2002

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