Latest Results of the KARMEN2 Experiment

Abstract

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.

arXiv comment7 pages including 5 figures; contribution to the proceedings of the Neutrino'2000 conference, Sudbury, June 16-21, 2000

References in corpus (4)

• A Unified Approach to the Classical Statistical Analysis of Small Signals
• Evidence for Neutrino Oscillations from Muon Decay at Rest
• A High Statistics Search for muon-neutrino(anti-muon-neutrino) ---> electron-neutrino(anti-electron-neutrino) Oscillations in the Small Mixing Angle Regime
• Compatibility Analysis of the LSND Evidence and the KARMEN Exclusion for numubar->nuebar Oscillations

Cited by in corpus (30)

• Neutrino Mass and Mixing with Discrete Symmetry
• Flavour physics of leptons and dipole moments
• Unitarity of the Leptonic Mixing Matrix
• Neutrino Mass Models
• General bounds on non-standard neutrino interactions
• Physics at a future Neutrino Factory and super-beam facility
• Muon conversion to electron in nuclei in type-I seesaw models
• Recent Progress in Neutrino Factory and Muon Collider Research within the Muon Collaboration
• Reactor-based Neutrino Oscillation Experiments
• Explaining LSND by a decaying sterile neutrino
• Neutrino Mass Spectrum and Future Beta Decay Experiments
• Frequentist analyses of solar neutrino data (updated including KamLAND and SNO data)
• Models of Neutrino Masses: Anarchy versus Hierarchy
• Majorana Neutrinos, Neutrino Mass Spectrum, CP-Violation and Neutrinoless Double Beta-Decay: II. Mixing of Four Neutrinos
• Relic neutrino masses and the highest energy cosmic rays
• Connecting bimaximal neutrino mixing to a light sterile neutrino
• Neutrino non-standard interactions meet precision measurements of $N_{\mathrm{eff}}$
• If sterile neutrinos exist, how can one determine the total solar neutrino fluxes?
• Neutrino oscillations and Non-Standard Interactions
• Neutrino anomalies and large extra dimensions
• Probing muonic charged current nonstandard interactions at decay-at-rest facilities in conjunction with T2HK
• Sensitivity of future lepton colliders and low-energy experiments to charged lepton flavor violation from bileptons
• Another Look at Confidence Intervals: Proposal for a More Relevant and Transparent Approach
• Combining LSND and Atmospheric Anomalies in a Three-Neutrino Picture
• Theoretical Aspects of Neutrino Oscillation
• Search for Hidden Neutrinos at the European Spallation Source: the SHiNESS experiment
• The eV-Scale Sterile Neutrino and Neutrinoless Double Beta Decay
• Sensitivity to the KARMEN Timing Anomaly at MiniBooNE
• Phenomenological analysis of properties of the RH Majorana neutrino in the seesaw mechanism
• The experimental future of Neutrino Oscillations