Gio Leone

XENONnT $pp$-Dominated Solar Neutrinos Constrain the $\nu_1$ Pseudo-Dirac Splitting

XENONnT has measured a low-energy solar-neutrino signal dominated by $pp$ neutrinos. At these energies, an ultra-small pseudo-Dirac mass-squared splitting induces detectable active-sterile oscillations over the Sun--Earth baseline. We study pseudo-Dirac oscillations of the first mass eigenstate, compute the resulting m...