Probing the Type I Seesaw mechanism with displaced vertices at the LHC Alberto M. Gago, Pilar Hernández, Joel Jones-Pérez, Marta Losada and Alexander Moreno Briceño Eur. Phys. J. C, 75 10 (2015) 470 Published online: 01 October 2015 DOI: 10.1140/epjc/s10052-015-3693-1