Parameter degeneracy and reactor experiments

Abstract

Degeneracies of the neutrino oscillation parameters are explained using the ${\sin }^{2}2{\theta }_{13}$--$s_{23}^2$ plane. Measurements of ${\sin }^{2}2{\theta }_{13}$ by reactor experiments are free from the parameter degeneracies which occur in accelerator appearance experiments, and reactor experiments play a role complementary to accelerator experiments. It is shown that the reactor measurement may be able to resolve the degeneracy in ${\theta }_{23}$ if ${\sin }^{2}2{\theta }_{13}$ and ${\cos }^{2}2{\theta }_{23}$ are relatively large.

8 pages, 12 figures, uses ws-procs9x6.cls. To appear in the proceedings of 4th Workshop on Neutrino Oscillations and their Origin (NOON2003), Kanazawa, Japan, 10-14 Feb 2003