KARMEN Limits on nue -> nutau Oscillations in 2-neutrino and 3-neutrino Mixing Schemes
Abstract
The 56 tonne high resolution liquid scintillation calorimeter KARMEN at the beam stop neutrino source ISIS has been used to search for neutrino oscillations in the disappearance channel nue->x. The nue emitted in mu+ decay at rest are detected with spectroscopic quality via the exclusive charged current reaction 12-C(nue,e-)12-Ng.s. almost free of background. Analysis of the spectral shape of e- from the nue induced reaction as well as a measurement of the absolute nue flux allow to investigate oscillations of the type nue->nutau and nue->numu . The flux independent ratio R(CC/NC) of charged current events 12-C(nue,e-)12-Ng.s. to neutral current events 12-C(nu,nu')12-C* provides additional information in the oscillation channel nue->x . All three analysis methods show no evidence for oscillations. For the nue->nutau channel 90%CL limits of sin2(2t)<0.338 for dm2>100eV2 and dm2<0.77eV2 for maximal mixing in a simple 2 flavor oscillation formalism are derived. A complete 3 flavor analysis of the experimental data from five years of measurement with respect to nue<->nutau and nue<->numu mixing is presented.
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