Probing the Type I Seesaw mechanism with displaced vertices at the LHCAlberto M. Gago, Pilar Hernández, Joel Jones-Pérez, Marta Losada and Alexander Moreno BriceñoEur. Phys. J. C, 75 10 (2015) 470DOI: https://doi.org/10.1140/epjc/s10052-015-3693-1