Charged Higgs boson effects in the production and decay of a heavy Majorana neutrino at the CERN LHC

We consider a new interaction between a heavy Majorana neutrino (N) and a charged Higgs boson (H-+/-), and show that it can have drastic implications on lepton-number-violating (LNV) signal of same-sign dileptons at the CERN LHC. The LNV signal of heavy Majorana neutrinos previously considered at the LHC, pp -> l(+)N -> l(+)l(+)W(-), may be overwhelmed by pp -> l(+)N -> l(+)l(+)H(-). With the subsequent decays H- -> (t) over barb or H- -> (W-H0), the heavy Majorana neutrino production leads to the spectacular events of l(+)l(+)b (b) over bar + 2 jets. We also explore the case m(N) < m(H)(+), where the decay H+ -> l(+)N can become the dominant N-production mechanism at the LHC. In particular, we show that the process gb -> tH(-) followed by t -> bW(+) and H- -> l(-)N -> l(-)l(-)W(+) could lead to another type of spectacular events of l(-)l(-)b + 4 jets.