Probing CPT breaking induced by quantum decoherence at DUNE

摘要

We show that the decoherence phenomena applied to the neutrino system could lead to an observable breaking of the fundamental CPT symmetry. We require specific textures of nondiagonal decoherence matrices, with nonzero δ_(CP), for making such observations. Using the information from the CPT conjugate channels νμ → νμ and ˉνμ → ˉνμ and their corresponding backgrounds, we have estimated the sensitivity of the DUNE experiment for testing CPT under the previous conditions. Four scenarios for energy-dependent decoherence parameters, ΓE_ν = Γ × (E_ν/GeV)~n, n = -1, 0, 1, and 2, are taken into account, and for most of them, DUNE is able to achieve a 5σ discovery potential, having Γ in O(10~(-23) GeV) for δ_(CP) = 3π=2. Meanwhile, for δ_(CP) = π/2, we reach 3σ for Γ in O(10~(-24) GeV).