%0 Journal Article %T GeV Majorana Neutrinos in Top-quark Decay at the LHC %A Si %A Zongguo %A Wang %A Kai %J High Energy Physics - Phenomenology %D 2008 %I %R 10.1103/PhysRevD.79.014034 %X We explore the \Delta L=2 same-sign dilepton signal from top-quark decay via a Majorana neutrino at the LHC in the top anti-top pair production samples. The signature is same-sign dilepton plus multi-jets with no significant missing energy. The most optimistic region lies where the Majorana neutrino mass is between 15-65 GeV. For 300 fb^-1 integrated luminosity, it is possible to probe S_{ij}, the effective mixing parameter, to order of 10^-5. %U http://arxiv.org/abs/0810.5266