2017/02/13 by Shrihari Gopalakrishna, Gopalakrishna, Shrihari, Tuhin Subhra Mukherjee +1 · 1 citation
Physics and Astronomy · #Atomic and Subatomic Physics Research #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #hep-ph
paper · pdf · doi:10.48550/arxiv.1702.04000
Reorganized text to improve readability; simplified unitarity constraints section; results unchanged
openalex publication_date 2017/02/13 · arxiv created 2017/12/15 · arxiv updated 2017/12/18 · openalex created_date 2022/10/04 · openalex updated_date 2026/07/28
We study a gauge-singlet vector-like fermion hidden-sector dark matter model, in which the communication between the dark matter and the visible standard model sector is via the Higgs-portal scalar-Higgs mixing, and also via a hidden-sector scalar with loop-level couplings to two gluons and also to two hypercharge gauge bosons induced by a vector-like quark. We find that the Higgs-portal possibility is stringently constrained to be small by the recent LHC di-Higgs search limits, and the loop-induced couplings are important to include. In the model parameter space, we present the dark matter relic-density, the dark-matter-nucleon direct-detection scattering cross-section, the LHC diphoton rate from gluon-gluon fusion, and the theoretical upper-bounds on the fermion-scalar couplings from perturbative unitarity.