arXiv subjects

F. N. Díaz

Publications and source records attributed to F. N. Díaz.

3 recordsLinked to original sources

arXiv2021

Uncovering Majorana nature through a precision measurement of $CP$ phase

We show the possibility to discover the neutrino nature by measuring the Majorana CP phase at the DUNE experiment. This phase is turned on by a decoherence environment, possibly originated by physics at the Planck scale. A sizable distortion in the measurement of the Dirac CP violation phase $δ_{\mathrm{CP}}$ is observed at DUNE when compared with T2HK measurement due to decoherence and non-null Majorana phase. Being that, when the measurement of the Majorana phase is performed at DUNE, it reaches a precision of 23 (21) $\%$ for a decoherence parameter $Γ=4.5(5.5)\times 10^{-24} \mathrm{GeV}$ and a Majorana phase equal to $1.5 π$. The latter precision is similar to the one obtained at the T2K experiment at its current Dirac CP violation phase measurement.

hep-ph↗

arXiv2020

Effects of the Violation of the Equivalence Principle at DUNE

A number of different effects of the violation of the Equivalence Principle (VEP), taken as sub-leading mechanism of neutrino flavor oscillation, are examined within the framework of the DUNE experiment. We study the possibility of obtaining a misleading neutrino oscillation parameter region caused by our unawareness of VEP. Additionally, we evaluate the impact on the measurement of CP violation and the distinction of neutrino mass hierarchy at DUNE. Besides, limits on VEP for a wide variety of textures of the matrix that connects neutrino gravity eigenstates to flavor eigenstates are imposed. An extra-task of our study is to set limits on Hamiltonian added terms considering different energy dependencies ($E^n$, with $n=0,1,2,3$) that can be associated to the usual Lorentz violating terms defined in the Standard Model Extension Hamiltonian. In order to understand our results, approximated analytical three neutrino oscillation probability formulae are derived.

hep-ph↗

arXiv2018

Probing CPT breaking induced by quantum decoherence at DUNE

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 $δ_{CP}$, for having such observations. Using the information from the CPT conjugate channels: $ν_μ \rightarrow ν_μ$ and $\barν_μ \rightarrow \barν_μ$ 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 $Γ_{E_ν}=Γ\times (E_ν/\mathrm{GeV})^n$, $n=-1,0,1,$ and $2$ are taken into account, for most of them, DUNE is able to achieve a 5$σ$ discovery potential having $Γ$ in $\mathcal{O} (10^{-23}$ GeV) for $δ_{CP}=3π/2$. Meanwhile, for $δ_{CP}=π/2$ we reach 3$σ$ for $Γ$ in $\mathcal{O} (10^{-24}$ GeV).

hep-ph↗