Probing TeV-scale Majorana neutrinos at a muon-proton collider via a lepton-number-violating fat-jet signature

We investigate the sensitivity to TeV-scale heavy Majorana neutrinos at a future muon-proton collider with $\sqrt{s}=5.3$~TeV, based on 1~TeV muon and 7~TeV proton beams. We focus on the lepton-number-violating (LNV) process $μ^- p \to jN$, followed by $N\toμ^+W^-\toμ^+J$, leading to the characteris