GeV Majorana Neutrinos in Top-quark Decay at the LHC

Understand

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.