Speaker
Description
We show that the crucial measurement of the CP violation phase ($\delta_{\mathrm{CP}}$), planned to be performed at the DUNE experiment, can be spoiled if we assume the decoherence phenomena in nature, with sizeable effects. Considering this framework, we find that the $\sin^2{\theta_{13}}$ and $\delta_{\mathrm{CP}}$ can be distorted from the current best-fit values. The discrepancies for $\delta_{\mathrm{CP}}$ can reach values up to $ 4.34 \sigma (5.47 \sigma)$, for a decoherence magnitude of $\Gamma = 2.5 (3.5) \times 10^{-24} \ \mathrm{GeV}$ and a value of $\phi_1=1.5 \pi$ for the Majorana phase. Furthermore, we analyze the ability of DUNE to measure the Majorana phase, obtaining a precision of $23(21)\%$ for a decoherence parameter $\Gamma=4.5(5.5)\times 10^{-24} \ \mathrm{GeV} $ and a Majorana phase $\phi_1=1.5\pi$. In this way, we have introduced a rather novel possibility for elucidating a non-null Majorana phase.
This work is based on PhysRevD.105.035010
https://doi.org/10.1103/PhysRevD.105.035010
