Results from the short baseline experiments at CERN

TL;DR

This paper reports the results of short-baseline neutrino oscillation experiments at CERN, focusing on muon and tau neutrino oscillations, and sets new limits on oscillation parameters relevant to dark matter and particle physics.

Contribution

It provides the first combined results from the CHORUS and NOMAD experiments on muon-tau neutrino oscillations at CERN, excluding certain oscillation parameters at 90% confidence level.

Findings

Excluded oscillations for squared mass difference > 1 eV² at 90% C.L.

Set upper limits on mixing angles around 10^{-4}.

Contributed to understanding neutrino oscillations related to dark matter.

Abstract

Considerations based on particle physics (in particular the so-called see-saw mechanism) and on cosmology, in relation to the Dark Matter question, motivated the search for numu nutau oscillation in the region of small mixing angles. We present here the outcome of the short-baseline programme carried out at CERN by the CHORUS and NOMAD experiments. Both experiments are about to publish their final results. At values of squared mass difference greater than 1 eV2 oscillations between numu and nutau are excluded at 90% C.L. down to mixing angles values of O(10^{-4}).