Search for Sterile Neutrinos at OPERA and other Long--Baseline Experiments

TL;DR

This paper reports on searches for sterile neutrinos using data from OPERA and other long-baseline experiments, providing new limits on sterile neutrino mixing parameters and updating previous analyses.

Contribution

It presents preliminary results within the 3+1 neutrino framework and compares findings across multiple long-baseline experiments, offering a comprehensive overview.

Findings

New limits on sterile neutrino mixing parameters

Updated analysis of $ u_{} ightarrow u_e$ channel

Summary of sterile neutrino searches at various experiments

Abstract

The OPERA experiment at the CNGS beam has observed muon to tau neutrino oscillations in the atmospheric sector. Based on this result new limits on the mixing parameters of a massive sterile neutrino may be set. Preliminary results of the analysis done in the 3+1 neutrino framework are here presented. An update of the search for sterile neutrinos in the $\nu_{\mu} \rightarrow \nu_e$ channel is also given. The status of the searches for sterile neutrinos performed at other Long--Baseline experiments (MINOS at NuMI beam and SuperK with the atmospheric flux) is also briefly recalled. Finally, some personal perspectives are discussed.