2019/07/31 by Tarak Nath Maity, Tirtha Sankar Ray
Materials Science · Physics and Astronomy · #Anisotropy #Annihilation #Chemical and Physical Properties of Materials #Cosmic microwave background #Dark Matter and Cosmic Phenomena #Dark matter #Parameter space #Particle physics theoretical and experimental studies #Scalar (mathematics) #Scalar field dark matter #hep-ph
paper · pdf · doi:10.1088/1475-7516/2019/11/033
published as JCAP11(2019)033 · 15 pages, 5 figures, 1 table; Accepted for publication in JCAP
openalex created_date 2019/07/30 · arxiv created 2019/11/08 · openalex publication_date 2019/11/26 · arxiv updated 2019/12/17 · openalex updated_date 2026/08/05
Assisted annihilation is a novel mechanism to generate viable sub-GeV thermal dark matter, where a pair of stable dark matter annihilates with an assister to Standard Model states. Typically such 3 → 2 annihilation topologies are flux suppressed compared to 2 → 2 processes. In this paper, we explore the possibility of a resonant 3 → 2 assisted annihilation dominantly driving the freeze-out of dark matter. We demonstrate that in a simple multipartite scalar extension of the Standard Model this can be realized in certain regions of parameter space to provide viable dark matter relic density, in agreement with observation. We demonstrate that for photophilic assisters parts of the parameter space are already constrained by indirect detection experiments and the measurements of CMB anisotropies while substantial regions remain beyond the present limit.