2007/01/31 by Xiao-Gang He, Tong Li, Xue-Qian Li +1 · 76 citations
Physics and Astronomy · #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark matter #Electroweak interaction #Higgs boson #Large Hadron Collider #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Physics beyond the Standard Model #Quark #Scalar (mathematics) #Standard Model (mathematical formulation) #Top quark #Two-Higgs-doublet model #hep-ph
paper · pdf · doi:10.1142/s0217732307025376
published in Modern Physics Letters A 22(25n28), 2121-2129 (World Scientific) · 6 pages, 4 figures, Contribution to 2006 Symposium of CosPA; Typos corrected and new references added
arxiv created 2007/01/31 · openalex publication_date 2007/09/06 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We study possible observational effects of scalar dark matter, the darkon D, in Higgs h and top quark t decay processes, h → DD and t → cDD in the minimal Standard Model (SM) and its two Higgs doublet model (THDM) extension supplemented with a SM singlet darkon scalar field D. We find that the darkon D can have a mass in the range of sub-GeV to several tens of GeV, interesting for LHC and ILC colliders, to produce the required dark matter relic density. In the SM with a darkon, t → cDD only occurs at loop level giving a very small rate, while the rate for Higgs decay h → DD can be large. In THDM III with a darkon, where tree level flavor changing neutral current (FCNC) interaction exists, a sizable rate for t → cDD is also possible.