2012/07/02 by André de Gouvêa, Andre de Gouvea, Wei-Chih Huang +5
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:10.48550/arxiv.1207.0510
v2: Updated to reflect latest Xenon100 and LHC Higgs results, small changes in discussion of resonant annihilation, added comments on possibility of subdominant DM contribution; 23 pages, 5 figures
arxiv created 2012/10/22 · arxiv updated 2012/10/23
The addition of new multiplets of fermions charged under the Standard Model gauge group is investigated, with the aim of identifying a possible dark matter candidate. These fermions are charged under SU(2)× U(1), and their quantum numbers are determined by requiring all new particles to obtain masses via Yukawa couplings and all triangle anomalies to cancel as in the Standard Model; more than one multiplet is required and we refer to such a set of these multiplets as a polyplet. For sufficiently large multiplets, the stability of the dark matter candidate is ensured by an accidental symmetry; for clarity, however, we introduce a model with a particularly simple polyplet structure and stabilize the dark matter by imposing a new discrete symmetry. We then explore the features of this model; constraints from colliders, electroweak precision measurements, the dark matter relic density, and direct detection experiments are considered. We find that the model can accommodate a viable dark matter candidate for large Higgs boson masses; for mH∼ 125 GeV, a subdominant contribution to the dark matter relic density can be achieved.