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Preliminary results of MINOS experiment indicate that theta23 is not maximal.Global fits to world neutrino data suggest two nearly degenerate solutions fortheta23: one in the lower octant (LO: theta23 < 45 degree) and the other in thehigher octant (HO: theta23 > 45 degree). numu to nue oscillations in superbeamexperiments are sensitive to the octant and are capable of resolving thisdegeneracy. We study the prospects of this resolution by the current T2K andupcoming NOvA experiments. Because of the hierarchy-deltacp degeneracy and theoctant-deltacp degeneracy, the impact of hierarchy on octant resolution has tobe taken into account. As in the case of hierarchy determination, there existfavorable (unfavorable) values of deltacp for which octant resolution is easy(challenging). However, for octant resolution the unfavorable deltacp values ofthe neutrino data are favorable for the anti-neutrino data and vice-verse. Thisis in contrast to the case of hierarchy determination. In this paper, wecompute the combined sensitivity of T2K and NOvA to resolve the octantambiguity. If sin^2\theta23 =0.41, then NOvA can rule out all the values oftheta23 in HO at 2 sigma C.L., irrespective of the hierarchy and deltacp.Addition of T2K data improves the octant sensitivity. If T2K were to have equalneutrino and anti-neutrino runs of 2.5 years each, a 2 sigma resolution of theoctant becomes possible provided sin^2\theta23 \leq 0.43 or \geq 0.58 for anyvalue of deltacp.

Resolving the octant of theta23 with T2K and NOvA