Model-independent test for CPT violation using long-baseline and atmospheric neutrino experiments

Charge-Parity-Time (CPT) symmetry governs that the oscillation parameters for neutrinos and anti-neutrinos are to be identical. Different mass and mixing parameters for these particles may give us a possible hint for CPT violation in the neutrino sector. Using this approach, we discuss the ability of long-baseline and atmospheric neutrino experiments to determine the difference between mass squared splittings ($Δm^{2}_{32}-Δ\bar{m}^{2}_{32}$) and atmospheric mixing angles ($\sin^{2}θ_{23}-\sin^{2}\barθ_{23}$) of neutrinos and anti-neutrinos. We show the joint sensitivity of the T2K, NOvA and INO experiments to such CPT violating observables in different possible combinations of octant for neutrinos and anti-neutrinos.

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