Displaced Heavy Neutral Lepton from New Higgs Doublet

2024/06/24 by Yang, Fa-Xin, Shao, Feng-Lan, Han, Zhi-Long +2
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2406.16269

Abstract

Heavy neutral leptons N are introduced to explain the tiny neutrino masses via the seesaw mechanism. For proper small mixing parameter V_{ℓ N}, the heavy neutral leptons N become long-lived, which leads to the displaced vertex signature at colliders. In this paper, we consider the displaced heavy neutral lepton from the neutrinophilic Higgs doublet Φ_ν decay. The new Higgs doublet with MeV scale VEV can naturally explain the tiny neutrino masses with TeV scale N. Different from current experimental searches via the W^±→ ℓ^± N decay, the new decays as H^±→ ℓ^± N are not suppressed by the small mixing parameter V_{ℓ N}. Therefore, a larger parameter space is expected to be detected at colliders. We then investigate the promising region at the 14 TeV HL-LHC and the 3 TeV CLIC. According to our simulation, the DV signature could probe |V_{ℓ N}|²\gtrsim10^-19 with m_N

Related

• Heavy Neutral Leptons and displaced vertices at LHC
• Heavy Neutral Leptons without Prejudice
• Searching for Heavy Neutral Leptons with Displaced Vertices at the LHC
• Reconstructing a Heavy Neutral Lepton at the LHC
• Constraining Heavy Neutral Leptons Coupled to the Tau-Neutrino Flavor at the Large Hadron Collider