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Preliminary results of MINOS experiment indicate that θ23 is not maximal. Global fits to world neutrino data suggest two nearly degenerate solutions for θ23: one in the lower octant (LO: θ23 < 45◦) and the other in the higher octant (HO: θ23 > 45◦). νμ → νe oscillations in superbeam experiments are sensitive to the octant and are capable of resolving this degeneracy. We study the prospects of this resolution by the current T2K and upcoming NOνA experiments. Because of the hierarchy-δCP degeneracy and the octant-δCP degeneracy, the impact of hierarchy on octant resolution has to be taken into account. As in the case of hierarchy determination, there exist favorable (unfavorable) values of δCP for which octant resolution is easy (challenging). However, for octant resolution the unfavorable δCP values of the neutrino data are favorable for the antineutrino data and vice-verse. This is in contrast to the case of hierarchy determination. In this work, we compute the combined sensitivity of T2K and NOνA to resolve the octant ambiguity. If sin2 θ23 = 0.41, then NOνA can rule out all the values of θ23 in HO at 2σ C.L., irrespective of the hierarchy and δCP. We show that a balanced neutrino-anti-neutrino run of T2K is better for octant resolution compared to pure neutrino run.

Resolving the octant of &theta;_{23} with T2K and NO&nu;A

Resolving the octant of θ_{23} with T2K and NOνA