Top quark as a probe of heavy Majorana neutrino at the LHC and future collider
Ning Liu, Zong-guo Si, Lei Wu, Hang Zhou, Bin Zhu
Right-handed (RH) Majorana neutrinos play a crucial role in understanding the origin of neutrino mass, the nature of dark matter and the mechanism of matter-antimatter asymmetry. In this work, we investigate the observability of heavy RH Majorana neutrino through the top quark neutrinoless double beta decay process t→bℓ+ℓ+jj′ (ℓ=e,μ) at hadron colliders. By performing detector level simulation, we demonstrate that the heavy neutrinos with the mixing parameters |VeN,μN|2≳5×10−6 in the mass range of 15 GeV <mN< 80 GeV can be excluded at 2σ level at 13 TeV LHC with the luminosity of 36 fb−1, which is stronger than other existing collider bounds. The future HL-LHC will be able to further probe the mixings |VeN,μN|2 to about 1.4×10−6.