Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2000-08-02
Nucl.Phys.Proc.Suppl.91:191-197,2001
Physics
High Energy Physics
High Energy Physics - Experiment
7 pages including 5 figures; contribution to the proceedings of the Neutrino'2000 conference, Sudbury, June 16-21, 2000
Scientific paper
10.1016/S0920-5632(00)00940-3
The neutrino experiment KARMEN at the beam stop neutrino source ISIS investigates the oscillation channel numubar->nuebar in the appearance mode by looking for p(nuebar,e+)n reactions. An analysis of data collected from February 1997 through March 2000 with the KARMEN2 experimental setup reveals 11 candidate events in good agreement with the background expectation of 12.3+-0.6 events. Hence, there is no indication of an oscillation signal. A maximum likelihood analysis of the data leads to an upper limit (at 90% confidence level) for the mixing angle of sin^2(2theta) < 1.3x10^-3 at large Dm^2 and Dm^2 < 0.049 eV^2 for sin^2(2theta)=1. The anomaly in the time spectrum of events induced by nue and numubar seen in the KARMEN1 data could not be confirmed with the KARMEN2 data.
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