Probing CPT breaking induced by quantum decoherence at DUNE

Abstract

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

Effects of the violation of the equivalence principle at DUNE

“…3 the differences in the ν μ → ν e channel are of the same order than in the last case, which is because of the appearance in the probability of terms s 13 Δγ 31 ∼ Oð0.01Þ, similar to those in Eq. (30). Since here Δγ 31 is taken as positive, the sign of the overall contribution depends only on them being neutrinos (negative) or antineutrinos (positive).…”

“…The neutrino oscillation is caused by slight differences between neutrino masses (squared masses), which are already small in themselves, and the lack of coincidence between neutrino mass eigenstates and flavor eigenstates [1][2][3][4][5][6][7][8][9]. The long-distance interferometry characteristic of neutrino oscillations, in addition to their energy dependency, allows us to test subleading effects that can be produced by a variety of beyond standard oscillation physics such as nonstandard interaction [10][11][12][13][14], neutrino decay [15][16][17][18][19][20][21][22][23][24], quantum decoherence [25][26][27][28][29][30][31], among others [32][33][34]. Nowadays, we are moving toward a neutrino oscillation physics precision era which implies that our sensitivity for performing searches for signatures from nonstandard physics would be increased as well.…”

Neutrino oscillation phenomenology in the standard model and beyond

“…Note that CPT violation might also be induced through different new physics scenarios, such as decoherence[219][220][221] or Lorentz violation[14,[222][223][224].…”

Snowmass White Paper: Beyond the Standard Model effects on Neutrino Flavor

“…Limits on quantum decoherence parameters are studied from available neutrino data [436,[438][439][440][441]. A class of models with nonzero decoherence is especially interesting because that could be used to explain neutrino data anomalies [442][443][444][445], or be a source of CPT violation [446], or for certain models, it would give us a hint of the existence of non-zero CP-Majorana phase [447]. Neutrino coherent oscillation data are also used to test alternative quantum mechanics models [448,449].…”