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Impact of two mass scale oscillations on the analysis of atmospheric and reactor neutrino data

  • M.C. Gonzalez-Garcia
  • M. Maltoni
Theoretical Physics

Abstract.

We study the stability of the results of the three-neutrino oscillation analysis of atmospheric and reactor neutrino data under departures of the one dominant mass scale approximation. In order to do so we perform the analysis of atmospheric and reactor neutrino data in terms of three-neutrino oscillations where the effect of both mass differences is explicitly considered. We study the allowed parameter space resulting from this analysis as a function of the mass splitting hierarchy parameter \(\alpha=\Delta m^2/ \Delta M^2\) which parameterizes the departure from the one dominant mass scale approximation. We consider schemes with both direct and inverted mass ordering. Our results show that in the analysis of the atmospheric data the derived range of the largest mass splitting, \(\Delta M^2\), is stable, while the allowed ranges of mixing angles \(\sin^2\theta_{23}\) and \(\sin^2\theta_{13}\) are wider than those obtained in the one dominant mass scale approximation. Inclusion of the CHOOZ reactor data in the analysis results in the reduction of the parameter space in particular for the mixing angles. As a consequence the final allowed ranges of the parameters from the combined analysis are only slightly broader than when obtained in the one dominant mass scale approximation.

Keywords

Parameter Space Large Mass Mass Scale Combine Analysis Mass Difference 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg / Società Italiana di Fisica 2002

Authors and Affiliations

  • M.C. Gonzalez-Garcia
    • 1
  • M. Maltoni
    • 2
  1. 1.Theory Division, CERN, 1211 Geneva 23, Switzerland CH
  2. 2. Instituto de Física Corpuscular, Universitat de València - C.S.I.C., Edificio Institutos de Paterna, Apt. 22085, 46071 Valencia, Spain ES

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