Doublet-singlet model and unitarity

被引：21
作者：
Cynolter, G. [1 ]
Kovacs, J. [1 ]
Lendvai, E. [1 ]
机构：
[1] Eotvos Lorand Univ, MTA ELTE Theoret Phys Res Grp, Pazmany Peter Setany 1-A, H-1117 Budapest, Hungary
来源：
MODERN PHYSICS LETTERS A | 2016年 / 31卷 / 01期
关键词：
Beyond the Standard Model; dark matter; perturbative unitarity; mixing;
D O I：
10.1142/S0217732316500139
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We study the renormalizable singlet-doublet fermionic extension of the Standard Model (SM). In this model, the new vector-like fermions couple to the gauge bosons and to the Higgs via new Yukawa couplings that allow for nontrivial mixing in the new sector, providing a stable, neutral dark matter candidate. Approximate analytic formulae are given for the mass spectrum around the blind spots, where the dark matter candidate coupling to h or Z vanishes. We calculate the two particle scattering amplitudes in the model, impose the perturbative unitarity constraints and establish bounds on the Yukawa couplings.
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页数：15
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