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-->[script-l]⁺N-->[script-l]⁺[script-l]⁺W^-, may be overwhelmed by pp-->[script-l]⁺N-->[script-l]⁺[script-l]⁺H^-. With the subsequent decays H^--->[overline t]b or H^--->W^-H⁰, the heavy Majorana neutrino production leads to the spectacular events of [script-l]⁺[script-l]⁺b[overline b]+2 jets. We also explore the case m_N<m_H⁺, where the decay H⁺-->[script-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^--->[script-l]^-N-->[script-l]^-[script-l]^-W⁺ could lead to another type of spectacular events of [script-l]^-[script-l]^-b+4 jets.

©2008 The American Physical Society