2009/03/31 by Kingman Cheung, Seong Youl Choi, Jeonghyeon Song · 18 citations
Physics and Astronomy · #Chargino #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Higgsino #Lightest Supersymmetric Particle #Minimal Supersymmetric Standard Model #Neutralino #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Supersymmetry #hep-ph
paper · pdf · doi:10.1016/j.physletb.2009.05.022
published in Physics Letters B 677(1-2), 54-58 (Elsevier BV) · minor changes and references added
arxiv created 2009/05/01 · openalex publication_date 2009/05/15 · arxiv updated 2015/05/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The modest addition of the dimension-5 term λ(Hˆu⋅Hˆd)2/M to the superpotential of the minimal supersymmetric standard model (MSSM) originated from physics beyond the MSSM (BMSSM) has a significant impact on the scenario of the Higgsino-dominated neutralino state being the lightest supersymmetric particle (LSP). It increases the mass difference between the LSP and the lighter chargino as well as that between the LSP and the second-lightest neutralino. This enhances the LHC discovery potential of the chargino and neutralino decays, producing more energetic charged leptons or pions than the decays without the BMSSM corrections. Furthermore, the coannihilation between the lighter chargino or second-lightest neutralino and the LSP is reduced substantially such that the LSP mass does not have to be very heavy. Consequently, an almost pure Higgsino LSP with its mass ∼100 GeV in the BMSSM can account for all the relic density of cold dark matter in the Universe unless tanβ is too large.