Charged Higgs Boson Effects in the Production and Decay of a Heavy Majorana Neutrino at the LHC

TL;DR

This paper investigates how a new interaction involving charged Higgs bosons and heavy Majorana neutrinos can significantly alter lepton number violating signals at the LHC, leading to distinctive multi-particle events.

Contribution

It introduces a novel interaction mechanism between charged Higgs bosons and heavy Majorana neutrinos, affecting LHC signals and proposing new observable event signatures.

Findings

Charged Higgs interactions can dominate LNV signals at the LHC.

New event signatures include same-sign dileptons with b-jets and multiple jets.

Decay channels significantly impact neutrino production and detection.

Abstract

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 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- -> b t(bar) or H- -> W- H^0, the heavy Majorana neutrino production leads to the spectacular events of l+ l+ b b(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 g b -> t H- followed by t -> b W+ and H- -> l- N -> l- l- W+ could lead to another type of spectacular events of l- l- b + 4 jets.