# Latest Results of the KARMEN2 Experiment

Source: [Latest Results of the KARMEN2 Experiment](<https://www.sota2.com/research/paper/68fa2a831e209131ce83e549>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T13:36:45.041Z

Authors: K. Eitel

Published: 2000-08-02T14:37:54.000Z

## 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.

## Recorded benchmark results

A research result applies to its stated dataset, split, metric and evaluation configuration. Compare like-for-like settings, preserve the metric's unit and direction, and distinguish paper-reported results from independent reproduction. The best result recorded here is not a claim of exhaustive, current global coverage.

## Original sources and implementation

[Original paper](<https://arxiv.org/abs/hep-ex/0008002>)

[PDF](<https://arxiv.org/pdf/hep-ex/0008002.pdf>)