Probing CPT breaking induced by quantum decoherence at DUNE

Carrasco, J. C. (Sección Física, Departamento de Ciencias, Pontificia Universidad Católica del Perú, Apartado 1761, Lima, Perú) ; Díaz, F. N. (Sección Física, Departamento de Ciencias, Pontificia Universidad Católica del Perú, Apartado 1761, Lima, Perú) ; Gago, A. M. (Sección Física, Departamento de Ciencias, Pontificia Universidad Católica del Perú, Apartado 1761, Lima, Perú)

16 April 2019

Abstract: 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 δCP, for making such observations. Using the information from the CPT conjugate channels νμνμ and ν¯μν¯μ 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, ΓEν=Γ×(Eν/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(1023 GeV) for δCP=3π/2. Meanwhile, for δCP=π/2, we reach 3σ for Γ in O(1024 GeV).


Published in: Physical Review D 99 (2019)
Published by: APS
DOI: 10.1103/PhysRevD.99.075022
arXiv: 1811.04982
License: CC-BY-4.0



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