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Advances in High Energy Physics
Volume 2013, Article ID 464926, 22 pages
http://dx.doi.org/10.1155/2013/464926
Review Article

Neutrino Oscillations in the Atmospheric Parameter Region: From the Early Experiments to the Present

1Dipartimento di Fisica e Astronomia, University of Bologna, Viale Berti Pichat 6/2, 40127 Bologna, Italy
2INFN, Sezione di Bologna, Viale Berti Pichat 6/2, 40127 Bologna, Italy

Received 15 July 2013; Revised 9 October 2013; Accepted 5 November 2013

Academic Editor: Elisa Bernardini

Copyright © 2013 G. Giacomelli et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The aim of this paper is to provide a historical perspective on the main experimental steps which led to the current picture of neutrino oscillations in the “atmospheric parameter region.” In the 1980s a deficit of atmospheric muon neutrinos was observed with the first generation of underground experiments. In the following decade new experiments provided fundamental results which led to the discovery claims in 1998. At the beginning of the new century neutrino beams of medium and high energy became available and several long baseline experiments were performed and added new information to the atmospheric neutrino puzzle. The interpretation of the results of atmospheric and long baseline neutrino experiments was in terms of dominant oscillations. Short recollections are made of the SNO solar neutrino measurements, of the results with neutrino telescopes, and of reactor neutrinos to measure sin2 . Over the years the phenomenological picture improved in completeness and increased in complexity. A short perspective concludes the paper.