Effect of non-zero theta(13) on the measurement of theta(23)

Understand

The moderately large measured value of theta13 signals a departure from the approximate two-flavour oscillation framework.

• As a consequence, the relation between the value of theta23 in nature, and the mixing angle measured in muon neutrino disappearance experiments is non-trivial.
• In this paper, we calculate this relation analytically.
• We also derive the correct conversion between degenerate values of theta23 in the two octants.