Mixed WIMP-axion dark matter

被引:7
作者
Chatterjee, Suman [1 ]
Das, Anirban [1 ]
Samui, Tousik [2 ]
Sen, Manibrata [3 ,4 ]
机构
[1] Tata Inst Fundamental Res, Homi Bhabha Rd, Mumbai 400005, Maharashtra, India
[2] HBNI, Harish Chandra Res Inst, Reg Ctr Accelerator Based Particle Phys, Chhatnag Rd, Allahabad 211019, Uttar Pradesh, India
[3] Northwestern Univ, Dept Phys & Astron, 2145 Sheridan Rd, Evanston, IL 60208 USA
[4] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA
基金
美国国家科学基金会;
关键词
STRONG CP PROBLEM; PP COLLISIONS; HIGGS-BOSON; ROOT-S=13 TEV; SEARCH; CANDIDATES; PHYSICS; SCALE; INVARIANCE; PARTICLES;
D O I
10.1103/PhysRevD.100.115050
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We study the experimental constraints on a model of a two-component dark matter, consisting of the QCD axion, and a scalar particle, both contributing to the dark matter relic abundance of the Universe. The global Peccei-Quinn symmetry of the theory can be spontaneously broken down to a residual Z(2) symmetry, thereby identifying this scalar as a stable weakly interacting massive particle, i.e., a dark matter candidate, in addition to the axion. We perform a comprehensive study of the model using the latest data from dark matter direct and indirect detection experiments, as well as new physics searches at the Large Hadron Collider. We find that although the model is mostly constrained by the dark matter detection experiments, it is still viable around a small region of the parameter space where the scalar dark matter is half as heavy as the Standard Model Higgs. In this allowed region, the bounds from these experiments are evaded due to a cancellation mechanism in the dark matter-Higgs coupling. The collider search results, however, are shown to impose weak bounds on the model.
引用
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页数:16
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