Atmospheric neutrino results from Super-Kamiokande and Kamiokande - Evidence for nu_mu oscillations -

TL;DR

This paper presents atmospheric neutrino data from Super-Kamiokande and Kamiokande, providing strong evidence for muon neutrino oscillations into tau neutrinos with large mixing angles and specific mass-squared differences.

Contribution

It offers new experimental evidence supporting muon neutrino oscillations and constrains oscillation parameters using data from two major neutrino observatories.

Findings

Evidence for nu_mu <-> nu_tau oscillations

Large mixing angles with sin^2(2theta) close to 1

Delta-m^2 in the range of 10^-3 to 10^-2 eV^2

Abstract

New atmospheric neutrino results from Super-Kamiokande are presented. Results from Kamiokande on upward going muons are also presented. All these data, together with the Kamiokande atmospheric neutrino data give evidence for neutrino oscillations. Two flavor nu_mu <-> nu_tau oscillations, with large sin^2(2theta) and Delta-m^2 in the region of 10^-3 to 10^-2, explain all these data.