2009/08/31 by Wenyu Wang, Zhaohua Xiong, Jin Min Yang +1
Computer Science · Physics and Astronomy · #Computational Physics and Python Applications #Dark Matter and Cosmic Phenomena #Particle physics theoretical and experimental studies #hep-ph
paper · pdf · doi:10.1088/1126-6708/2009/11/053
published as JHEP 0911:053,2009 · Version in JHEP
arxiv created 2009/10/18 · openalex publication_date 2009/11/11 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
As discussed recently by Hooper and Tait, the singlino-like dark matter in the Minimal Supersymmetric Standard Model (MSSM) extended by a singlet Higgs superfield can give a perfect explanation for both the relic density and the Pamela result through the Sommerfeld-enhanced annihilation into singlet Higgs bosons (a or h followed by h->a a) with a being light enough to decay dominantly to muons or electrons. In this work we analyze the parameter space required by such a dark matter explanation and also consider the constraints from the LEP experiments. We find that although the light singlet Higgs bosons have small mixings with the Higgs doublets in the allowed parameter space, their couplings with the SM-like Higgs boson hSM (the lightest doublet-dominant Higgs boson) can be enhanced by the soft parameter Aκ and, in order to meet the stringent LEP constraints, the hSM tends to decay into the singlet Higgs pairs aa or hh instead of b b. So the hSM produced at the LHC will give a multi-muon signal, hSM -> aa -> 4 muons or hSM -> hh -> 4 a -> 8 muons.